LT1937
Info: : PRODUCTION
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LT1937

White LED Step-Up Converter in SC70 and ThinSOT

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Info: : PRODUCTION tooltip
Info: : PRODUCTION tooltip
Part Details
Part Models 4
1ku List Price Starting From $1.79
Features
  • Inherently Matched LED Current
  • High Efficiency: 84% Typical
  • Drives Up to Four LEDs from a 3.2V Supply
  • Drives Up to Six LEDs from a 5V Supply
  • 36V Rugged Bipolar Switch
  • Fast 1.2MHz Switching Frequency
  • Uses Tiny 1mm Tall Inductors
  • Requires Only 0.22µF Output Capacitor
  • Low Profile SC70 and ThinSOT Packaging
Additional Details
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The LT1937 is a step-up DC/DC converter specifically designed to drive white LEDs with a constant current. The device can drive two, three or four LEDs in series from a Li-Ion cell. Series connection of the LEDs provides identical LED currents resulting in uniform brightness and eliminating the need for ballast resistors. The LT1937 switches at 1.2MHz, allowing the use of tiny external components. The output capacitor can be as small as 0.22µF, saving space and cost versus alternative solutions. A low 95mV feedback voltage minimizes power loss in the current setting resistor for better efficiency.

The LT1937 is available in low profile SC70 and ThinSOT packages.

Applications

  • Cellular Phones
  • PDAs, Handheld Computers
  • Digital Cameras
  • MP3 Players
  • GPS Receivers
Part Models 4
1ku List Price Starting From $1.79

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Documentation

Documentation

Part Model Pin/Package Drawing Documentation CAD Symbols, Footprints, and 3D Models
LT1937ES5#TRMPBF
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LT1937ES5#TRPBF
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LT1937ESC6#TRMPBF
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LT1937ESC6#TRPBF
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Software & Part Ecosystem

Software & Part Ecosystem

Evaluation Kit

Evaluation Kits 2

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DC484A

LT1937ES5 | Single Cell White LED(4) Driver with On-Board Battery, VIN 2.7V - 5V

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DC507A

LT1937ESC6 | 2-Ckt, High Efficiency Constant-Current Single Cell Li-Ion White LED (4) Driver with On-Board Battery

Tools & Simulations

Tools & Simulations 1

LTspice® is a powerful, fast and free simulation software, schematic capture and waveform viewer with enhancements and models for improving the simulation of analog circuits.

To launch ready-to-run LTspice demonstration circuits for this part:

Step 1: Download and install LTspice on your computer.

Step 2: Click on the link in the section below to download a demonstration circuit.

Step 3: If LTspice does not automatically open after clicking the link below, you can instead run the simulation by right clicking on the link and selecting “Save Target As.” After saving the file to your computer, start LTspice and open the demonstration circuit by selecting ‘Open’ from the ‘File’ menu.

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